*{
    margin: 0;
    padding: 0;
}
.base{
    position: fixed;
    width: 100%;
    height: 100%;
    background-image: url(../asset/R-C.jfif);
    background-repeat: no-repeat;/*背景图像将只显示一次*/
}
button{
    width: 50px;
}
#context{
    width: 700px;
    height: 600px;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-left: -350px;
    margin-top: -300px;
    background-color: #fff;
    opacity: 0.7;
}
#title{
    width: 100%;
    height: 100px;
    float: left;
}
#canvas{
    float: left;
}
#title .left{
    width: 49%;
    height: 100%;
    float: left;
}
#title .left div{
    margin-left: 10px;
    margin-top: 4px;
    font-size: 14px;
}
#title .right,
#title .center{
    width: 25%;
    height: 100%;
    float: left;
    border-left: solid gray 1px;
}
#title .right{
    line-height: 50px;
    text-align: center;
    font-size: 20px;
}
#title .center div{
    float: left;
    width: 100%;
    text-align: center;
    font-style: 16px;
}
.model{
    width: 100%;
    height: 100%;
    background-color: #000;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 10;
    opacity: 0.65;
    display: none;
}
.model .context{
    width: 200px;
    height: 220px;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-top: -110px;
    margin-left: -100px;
    color: #fff;
}
.model .context img{
    margin-left: 20px;
}
.model .context div{
    text-align: center;
    margin-bottom: 5px;
}
.model .context button{
    width: 120px;
    height: 30px;
    background-color: #fff;
    color: #000;
    border-radius: 3px;
    border: none;
    margin-left: 40px;
    margin-top: 20px;
}